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Liabilities Related to Business Combinations and to Non-Controlling Interests - Additional Information (Details) - EUR (€) € in Millions		Jun. 30, 2024	Dec. 31, 2023
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items]
Fair value of contingent consideration payable	[1]	€ 728	€ 709
MSD contingent consideration (European Vaccines business)
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items]
Fair value of contingent consideration payable		€ 61	127
Increase in fair value of liability		1.00%
Shire contingent consideration arising from acquisition of Translate Bio
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items]
Fair value of contingent consideration payable		€ 526	441
Increase in fair value of liability		14.00%
Contingent consideration arising from acquisition of Amunix
Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [Line Items]
Fair value of contingent consideration payable		€ 140	€ 137
[1] As of January 1, 2024, this comprised a non-current portion of €501 million and a current portion of €208 million.

X

- Definition

The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2023-01-01
-Paragraph B67
-Subparagraph c
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-URIDate 2023-03-23

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- Definition

Disclosure Of Liabilities Related To Business Combinations And To Noncontrolling Interests [line items]

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- Definition

Percentage increase in fair value liabilities.

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